Gaya APA
Riyanto, S.
(2016).
Toefl Test of English as a Foreign Language Preparation
(
Pertama)
.
Yogyakarta:
Andi.
Gaya MLA
Riyanto, Slamet.
"Toefl Test of English as a Foreign Language Preparation".
Pertama
Yogyakarta:
Andi,
2016.
.